10.02.2026

Those Mysterious Stains on Your Underwear: Should You Be Worried?

By Vitia

Surely you have ever noticed that, at the end of the day, your underwear has strange whitish marks or discolorations for no apparent reason. This leads to doubt, discomfort, or even worry, especially if it happens frequently.

However, far from being an indication of something wrong, in most cases these spots simply reveal a natural phenomenon that many people are unaware of: vaginal pH. Understanding the reason for these signals can give you peace of mind and help you get to know your body better.

What do those marks on your underwear mean?

Far from being a cause for alarm, whitish stains on underwear are usually related to a completely normal process of the female body. Below, we tell you about its main causes.

1. Healthy vaginal discharge

Vaginal discharge is a natural secretion that helps keep the intimate area clean and protected. Their consistency and color can vary throughout the menstrual cycle. In many women, this discharge can leave white or slightly yellow marks when it dries on the fabric. It’s completely normal.

2. Acidic pH of the vagina

The vagina has a naturally acidic pH, which means it can wear down or discolor fabrics over time. These spots usually appear on dark underwear and don’t mean there’s an infection, but rather that your body is functioning well.

3. Oxidation of secretions

When in contact with air, some secretions can oxidize and change color. This can generate whitish, yellow or even light brown tones in underwear, without this meaning a health problem.

4. Wear of fabric by bodily substances

Over time, the acidity of the flow and constant contact with the skin can lead to slight wear and tear on certain fabrics, especially if they are not cotton. This produces marks that can be mistaken for “abnormal” spots.

5. Hormonal changes

During ovulation or the days leading up to your period, your body produces more flow, which can make these marks more visible. They can also intensify during pregnancy or menopause, without this being a cause for concern.

6. Perspiration

In some cases, sweat can also contribute to these marks. Moisture, combined with natural flow, can alter the texture of the fabric or leave lighter areas when drying.

Tips to take care of your intimate health and your underwear

  • Wear white cotton underwear: It is more breathable and helps you detect changes without the risk of misleading discoloration.
  • Avoid perfumed panty liners: They can alter the natural pH and cause irritation.
  • Wash your underwear with neutral soaps: Avoid harsh products that can fix stains or damage the fabric.
  • Don’t use harsh bleaches: Instead of removing stains, they can ruin the fabric and cause more skin irritation.
  • Visit the gynecologist if you notice unusual changes: Discharge with a bad smell, itching, greenish color or discomfort can indicate an infection.
  • Dry clothes well in the sun: Sunlight is an excellent natural disinfectant.

The next time you find a white stain on your underwear, don’t panic. Your body is talking, and in most cases, what it says is that it is functioning as it should. Listening to and understanding is the first step to full intimate health.



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